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Business combinations and disposals - Remploy (Details) - Remploy £ in Millions | Apr. 07, 2015 USD ($) | Apr. 07, 2015 GBP (£) | Apr. 07, 2015 GBP (£)
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Business combinations |  |  |
Share capital acquired (as a percent) | 70.00% |  | 70.00%
Share capital held in trust for the benefit of employees (as a percent) | 30.00% |  | 30.00%
Preliminary Purchase Price Accounting |  |  |
Purchase consideration, net of cash acquired | $ 3,000,000 | £ 2.0 |
Net assets | 0 |  |
Business Combinations, Noncontrolling Interest, Value | 900,000 |  | £ 0.6
Contract-based intangible assets |  |  |
Preliminary Purchase Price Accounting |  |  |
Intangible assets | $ 4,600,000 |  |
Amortization period of intangible assets | 2 years | 2 years |

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